Now here’s a free-agent addition by the Patriots that qualifies as big.

Real big.

As initially reported by the NFL Network, the Patriots came to terms on a two-year contract with 6-foot-6, 325-pound defensive tackle Tommy Kelly on Monday.

The hope in Foxboro will be that Kelly can provide depth at a position where Kyle Love (12 games, including one in the postseason) and Brandon Deaderick (six, including one in the postseason) started alongside Vince Wilfork last year.

Both Deaderick and Love are entering contract years with the Patriots in 2013.

The Patriots took a hit in the defensive line in December of last year when they were forced to admit that former second-round draft pick Ron Brace was a bust, releasing the 330-pounder from Boston College.

A lifelong Oakland Raider, the 32-year-old Kelly was part of the purge that team’s general manager, Reggie McKenzie, is conducting in the Bay Area.

Originally signed as an undrafted free agent out of Mississippi State, Kelly spent nine seasons with the Raiders prior to his release from the team on March 27.

Signed in 2008 by Al Davis, the late Raiders’ owner, to a seven-year contract worth slightly in excess of $50 million, Kelly was due to make $6.5 million this year.

Along with his size, Kelly brings durability to the Patriots’ defensive line.

In seven of his nine years in the league, including the last five, Kelly has appeared in all 16 of the Raiders’ games, totaling 419 tackles and 34 sacks over that time.

Kelly’s career highs in tackles came in 2006 and 2010 when he was credited with 68 and 60, respectively.

While lining up alongside former Patriot Richard Seymour in the middle of the Raiders’ line Kelly amassed 14.5 sacks over the 2010 and 2011 seasons, but he tailed off to just one while making 45 tackles last year.

Kelly’s one sack last year didn’t come until Dec. 16 in the Raiders’ 15-0 shutout of the Kansas City Chiefs.